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標題: Photocatalyzed N-de-ethylation and degradation of brilliant green in TiO2 dispersions under UV irradiation
作者: Chen, C.C.
Lu, C.S.
Fan, H.J.
Chung, W.H.
Jan, J.L.
Lin, H.D.
Lin, W.Y.
關鍵字: brilliant green;dye;photocatalytic;TiO2;N-de-ethylation;aqueous-solution;environmental photochemistry;sulforhodamine-b;malachite green;rhodamine-b;metal ions;azo dyes;nanoparticles;mechanism;photodegradation
Project: Desalination
期刊/報告no:: Desalination, Volume 219, Issue 1-3, Page(s) 89-100.
The photocatalytic degradation of Brilliant Green (BG, Bis(4-diethylaminophenyl)phenylmethylium chloride), a cationic dye, was investigated in an irradiated TiO2 aqueous dispersion. In this study, in order to obtain a better understanding on the mechanistic details of this TiO2-assisted photodegradation of the BG dye with UV irradiation, four intermediates of the process were separated, identified, and characterized by HPLC-PDA-ESI-MS technique. The results indicated that the N-de-ethylation degradation of BG dye took place in a stepwise manner to yield mono-, di-, tri-, and tetra-N-de-ethylated BG species generated during the processes. The photodcgradation of the BG dye featured competitive reactions between N-de-ethylation and cleavage of the BG chromophore ring structure at different pH values. However, most of all, the higher degradation rate at acid pH was observed for the cationic dyes of triphenyl methane of TiO2-mediated experiments for the first time. These results should be useful for future applications of the treatment technology to dye pollution.
ISSN: 0011-9164
DOI: 10.1016/j.desal.2007.05.009
Appears in Collections:植物病理學系

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